No compilation error on later declared variable reference

[koleo9am]

🔎 Search Terms

variable reference foreach before declaration

🕗 Version & Regression Information

• This is the behavior in every version available on Playground

⏯ Playground Link

https://www.typescriptlang.org/play?ts=5.4.2#code/MYewdgzgLgBADjAXDaAnAlmA5gbQLowC8MOA5AKYAeAhgLZwA25peA3AFBwB0AZiKgFFqwABYAKSkQB8MAN7sYMdDxgTC6ygEo5CxTACeXOAFcI42QF9NHRRfZWOoSLH1ESbIA

💻 Code

const p = [];
p.forEach(x => {
  if (x===x) {
    y.push({});
  }
});
const y = [];

🙁 Actual behavior

Usage of y in foreeach doesn't lead to compilation error. But it produces a runtime error.

🙂 Expected behavior

Compilation error on line y.push({});

Additional information about the issue

No response

[MartinJohns]

Duplicate of #56827 / #11498.

[typescript-bot]

This issue has been marked as "Duplicate" and has seen no recent activity. It has been automatically closed for house-keeping purposes.